• 1970 - Koss set the standard for full-size professional headphones with the iconic Pro/4AA
  • LEGENDARY SOUND - The first dynamic headphones to deliver true full frequency and high fidelity performance
  • ICONIC DESIGN – One of the most recognizable headphones around the world
  • NOISE ISOLATING – Over ear design with superior noise isolation
  • COIL CORD – Compact 8 ft coiled cord with 6.3mm (1/4 in) plug
  • HIGH FIDELITY AUDIO – 250 ohms / 10-25,000